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Ford 302 & 331
Flat Top

Factory Specs for the 302 Ford Stroke 3.000 Bore 4.000 Rod 5.090 Pin .912

306 Cu uses Stroke 3.000 Bore 4.030 Rod 5.090 Pin .912
331 Cu uses Stroke 3.250 Bore 4.030 Multiple Rod lengths and pins

302 - 5.090 Rod .912 Pin- Flat Top
Part #
Stroke
C/H
Bore
Weight
Compression Ratio*
Ring
Set
Purchase Online
58cc
61cc
64cc
68cc
3.000
1.600
4.000
4.030
4.040
4.060

508
510
512
514

9.54
9.65
9.68
9.76
9.20
9.30
9.34
9.41
8.88
8.98
9.02
9.09
8.50
8.60
8.63
8.71
315-0036

 

302 - 5.090 Rod - .912 - Flat Top - Moleculite
Part #
Stroke
C/H
Bore
Weight
Compression Ratio*
Ring
Set
Purchase Online
58cc
61cc
64cc
68cc
3.000
1.600
4.030
4.040
4.060

405
415
420

9.65
9.68
9.76
9.30
9.34
9.41
8.98
9.02
9.08
8.60
8.63
8.70
315-0066

331 - 5.400 Rod .912 Pin - Flat Top
Part #
Stroke
C/H
Bore
Weight
Compression Ratio*
Ring
Set
Purchase Online
58cc
61cc
64cc
68cc
3.250
1.175
4.000
4.030
4.040

470
472
474

10.25
10.37
10.41
9.8
9.98
10.03
9.54
9.65
9.69

9.12
9.23
9.27

315-0049

331 - 5.400 - ..927 Pin - Rod - Flat Top
Part #
Stroke
C/H
Bore
Weight
Compression Ratio*
Ring
Set
Purchase Online
58cc
61cc
64cc
68cc
3.250
1.175
4.000
4.030
4.040

470
472
474

10.25
10.37
10.41
9.8
9.98
10.03
9.54
9.65
9.69

9.12
9.23
9.27

315-0049

331 - 5.400 Rod - .912 Pin - Flat Top - Moleculite
Part #
Stroke
C/H
Bore
Weight
Compression Ratio*
Ring
Set
Purchase Online
58cc
61cc
64cc
68cc
3.250
1.175
4.030
4.040
4.060

353
361
371

10.37
10.41
10.49

9.99
10.03
10.11

9.65
9.69
9.76

9.23
9.27
9.34

315-0066

331/347 Big Bore - 5.400 Rod .912 Pin - Flat Top
Part #
Stroke
C/H
Bore
Weight
Compression Ratio*
Ring
Set
Purchase Online
58cc
61cc
64cc
68cc
3.250
1.175
4.125
4.155

437
457

10.75
10.87
10.36
10.48
10.01
10.12

9.57
9.68

CR1002

331/347 Big Bore - 5.400 Rod - .927 Pin - Flat Top
Part #
Stroke
C/H
Bore
Weight
Compression Ratio*
Ring
Set
Purchase Online
58cc
61cc
64cc
68cc
3.250
1.175
4.125
4.155

439
443

10.75
10.87
10.36
10.48
10.01
10.12

9.57
9.68

CR1002

Ring Groove: 1/16, 1/16, 3mm
Valve Relief Volume:
4.0cc
Note: Big Bore 331

* Compression ratio computed with .010 deck and .038 head gasket.

* Forged of 2618 High Strength Alloy.
* Pin Fitting and Double Spiral Locks Included.

 

SRS Pistons

Probe SRS forged pistons are designed for high performance street and most racing application. SRS pistons are available in a wide variety of designs, tuned to achieve the highest performance possible. Any combination from ultra light 2 barrel oval track to high performance street, to heavily boosted race cars will find Probe SRS Forged Pistons to be the perfect piston.

* 2618-t6 Forged Alloy
* Lightweight piston designs
* Tight running clearances
* Low drag skirt design
* Design specific valve relief's
* Lightweight wrist pins
* Full floating wrist pins
* Narrow piston rings
* Large variety of compression ratios

Anatomy Of A Better Piston

Anti-Setonation Grooves Reduces detonation by tempering pressure spikes, enhances piston life!
Pressure Equalization Channel Enhance ring seal, producing more power and enhancing fuel economy!
Slotted Drain Back Holes Slotted drain back holes prevent oil from collecting in the oil ring groove.
CNC Diamond Pinhole Finish Produces ultra straight pinholes and outstanding micro finish for extended life and durability.
Slotted Pin Oiling Slotted pin oiling enhances wrist pin and pin holes oiling for durability and long life.
CNC Diamond Skirt Finishing Retains oil on the piston skirt providing superior anti scuffing capability! Also reduces piston noise!
Ultra-Tight Running Clearance Increases piston and piston ring life and reduces blow by!
Precision Forged of Aircraft Alloy Aluminum Our forgings are approximately 75% stronger than hypoeutectic or hypereutectic castings!
Fully CNC Machined Domes and valve reliefs are fully CNC machined for consistency and precise clearance to valves and combustion chambers.

 
Call 1-877-354-3812
to order your Parts Today!

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About RPM Machine | Specials | Newsletter
RPM Machine-Performance Auto Parts
PO Box 281
Cedar Valley, Utah 84013
We carry parts from scat, je, wiseco, ross, crower, callies, eagle, cat, eagle
Most of our rotating assemblies include forged pistons
and 4340 steelcranks

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